White House national security adviser Robert O’Brien said Sunday that the recent shooting at a naval base in Pensacola, Fla., appears to be an act of terrorism.

“To me, it appears to be a terrorist attack,” O’Brien said on CBS' “Face the Nation”. “I don’t want to prejudge the investigation, but it appears that this may be someone that was radicalized. … It’s unclear whether he’s got ties to any other organizations.“

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Other officials have stopped short of calling Friday’s shooting at Naval Air Station Pensacola a terrorist attack. Three people were killed by a Saudi military trainee, who was subsequently killed by a sheriff’s deputy.

“I can’t say it’s terrorism at this time,” Defense Secretary Mark Esper said Saturday, ordering a review of procedures for vetting foreign nationals and security on military installations. “I think we need to let the investigators, the FBI, do its work and … get us the facts, and we’ll move out from there.“